Crazy Color Bubblegum Blue Hair Dye

My hair was bleached to a yellowy white root, with patchy pastel pink and yellow everywhere else. This blue seemed to just about cover up the pink, but was a lot weaker looking where my roots were so it looked really dodgy. I guess you'd have to completely whiten your hair for it to look good, which is a shame because it looked a really pretty colour on the bits of my hair where it had worked!